Kuest AI

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Learn Ruby 10x faster with AI

Paste your Ruby code or error and Kuest asks what you expect it to do, then helps you read blocks, hashes and classes until they make sense.

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4.87en iOS13,917,000+estudiantes ya estudian con Kuest

topics
10
Language type
Dynamic, object-oriented
Created by
Yukihiro Matsumoto (1995)
Best known for
Ruby on Rails

See how Kuest teaches it

It asks before it tells, so you do the thinking and it sticks.

You: I wrote doubled = [1, 2, 3].each { |n| n * 2 } but doubled is still [1, 2, 3]. Why?
Kuest: Good question to ask. What do you think each is for: building a new array, or just visiting every item?
You: I thought it goes through each item and changes it.
Kuest: It does visit every item, but it throws away what the block returns and gives back the original array. Which method keeps the block's result for each item?
You: map. So doubled = [1, 2, 3].map { |n| n * 2 } gives [2, 4, 6].
Kuest: Exactly. Use each when you want side effects like puts, and map when you want a new array of results.

each returns the original collection; map returns a new array built from what the block returns.

Students who lock in with Kuest

students
13,917,000+
App Store rating
4.87
countries
100+

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  • 3 hours → 40 minutes

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  • It never lets me skip a step

    “Annoying at first, lifesaver on test day. I could do every problem without it.”

    Freshman, Ohio

  • Better than my tutor

    “It's there at midnight, it's patient, and it costs less than one session with my old tutor.”

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  • My streak is at 94 days

    “The quests are ten minutes. I do them on the bus. Somehow I'm now the one explaining bio to my friends.”

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    “My son gets real help without me pretending I remember calculus, and I can see his progress every week.”

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The method

How to study Ruby with Kuest

Ruby reads almost like English, so it's easy to feel you understand it before you can write it. The fastest way to learn is to predict what a line returns before you check, then write small methods from memory. Short, regular practice with Enumerable methods matters more than long sessions.

  1. Paste your code or errorTutor chat

    Share the snippet or the error message you're stuck on. Kuest asks what you expected it to return and helps you trace why it didn't.

  2. Snap a screen or worksheetSnap a photo

    Take a photo of a slide, textbook exercise or your terminal and start working from exactly what you see.

  3. See how objects fit togetherTeaching board

    Kuest draws classes, modules and method lookup on the teaching board so you can see which include wins.

  4. Predict the outputQuizzes

    Take quizzes that show a Ruby snippet and ask what it returns, the skill that makes debugging much faster.

  5. Keep methods freshFlashcards

    Review map, select, reduce, each_with_object and friends with spaced flashcards so you reach for the right one.

  6. Find what's still shakyGap finder

    Kuest spots the ideas you keep missing, like blocks versus procs or symbols versus strings, and brings them back.

What you'll cover

Tap a topic to learn it now.

  1. 01Variables, strings and interpolationStore values and build text with interpolation like "Hi #{name}".
  2. 02Conditionals and truthinessUse if, unless and case, and know that only nil and false are falsy.
  3. 03Arrays and hashesStore lists and key-value data and look things up with symbols as keys.
  4. 04Loops and iteratorsRepeat work with each, times and each_with_index.
  5. 05BlocksPass blocks with do...end or braces and read what |item| stands for.
  6. 06Enumerable methodsTransform and filter data with map, select, reduce and sort_by.
  7. 07MethodsDefine methods with default and keyword arguments and implicit returns.
  8. 08Classes and objectsModel things with classes, initialize, instance variables and attr_accessor.
  9. 09Modules and mixinsShare behavior across classes with include and understand method lookup.
  10. 10Errors and debuggingRead a Ruby error message, find the failing line and handle errors with rescue.

Try asking

Tap a question and Kuest starts teaching it, step by step.

Helps you prepare for

  • Intro to programming courses taught in Ruby
  • Ruby on Rails bootcamps
  • Coding interviews in Ruby

A month of Kuest costs less than one hour with a tutor

Same patience, any hour, every subject. Or stay on the free plan for good.

Private tutor

$40–80for one hour

  • Booked days in advance
  • One subject per session
  • Stops when the hour ends

Kuest Plus

$10a month, billed yearly

  • Every subject and exam on this site
  • Any hour, as long as you need
  • Quizzes, flashcards, podcasts and mock exams

Study on any device

Phone, tablet or laptop. Your chats, plans and flashcards come with you.

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